linux-kernel - Re: High CPU load when machine is idle (related to PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later)

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Message-ID: <20101125133106.GA12914@brouette>
Date:	Thu, 25 Nov 2010 14:31:06 +0100
From:	Damien Wyart <damien.wyart@...e.fr>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	tmhikaru@...il.com, Venkatesh Pallipadi <venki@...gle.com>,
	Chase Douglas <chase.douglas@...onical.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: High CPU load when machine is idle (related to PROBLEM:
 Unusually high load average when idle in 2.6.35, 2.6.35.1 and later)

Hi Peter,

Do you have a plan about solving this problem in the coming weeks or
will it still be present in 2.6.37 final? I am not implying any critic
in any way, just want to know a status because compared to other bugs
discussed in lkml, this one has seen very little technical proposals
towards a resolution (except your attempts). People who signed off the
discussed commit did not make any technical analysis about the bug
reported and this gives a strange feeling. Earth will not stop rotating
if it is not solved, but I still this it is quite important and affects
many users.

> [74f5187ac873042f502227701ed1727e7c5fbfa9] sched: Cure load average vs> NO_HZ woes

> We've gone through two kernel releases with this commit, and I think
> I'm understandably curious why it's not been reverted if it's causing
> problems with no solution in sight.

Even with this commit reverted, the load is incorrect in NO_HZ mode, so
revert only is not enough.

-- 
Damien Wyart
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